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IMPROVEMENT- IN THIB MAiTUFAOTURE or FIRE-BRICK.

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KNOW ALL MEN BY THESE PRESENTS:

That I, SAMUEL-K. 'WELLMAN, of Nashua, in the county of Hillsborough, and State of New Hampshire,

have invented certain new and useful improvements in Fire-Bricks and I do hereby declare that the following is a full,"clear, and exact description thereof.

To enable those skilled in the art to which my invention belongs to riiako andiuse it, I will proceed to describe the same.

The nature of my mventipn consists in combining diamond rock after it has been properly crushed, with fire-clay, or fire-clay and sand. One good way of carrying out my invention'isas follows:

' Take, say -diamon(l rock, fine and coarsemiited, thirty-five percent; fire-sand, fifteen per cent.; firesclay,

fifty per cent. said materials being mixed, moulded,'andburnt in the usual manner. For some purposes a. good fire-brick may be made from, fire-clay, fifty per cent.; diamond rock, coarsely crushed, fifty per cent.; the

latter being crushed, say, to the size of kernels of wheat or corn. 4

:The use of diamond rock," with other suitable materials, in the manufacture of fire-brick, furnace-linmgs,

and other articles designed to resist great heat, renders such articles far superior to'those articles as heretofore made, since they resist the heat better, do not scale of so readily, and, besides, can be afforded at a very rea son-able price as compared with those manufactured in theold or ordinary manner.

Having thus described my improvements in the manufacture of fire-bricks, what I claim therein as-new and ofmyjnventiou, and desire to secure by Letters Patent, is- I i v I The use of diamond rock in themanufacture of fire-bricks, furn stantially as described. i I I v SAM. K. WELLMAN.- Witnesses:

, F; Mormon,

S. T. WF Lniurm'.

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